劍橋詞典architecture specialized a horizontal bar of stone or wood across a window , or separating the top of a window or door from a small window above （門(mén)窗的）橫檔，橫楣 US (also transom window); (UK fanlight) a small window over the top of a door 氣窗（門(mén)上方的小窗） 返回 transom